Groever, Benedikt Matlab code for virtual focal length Matlab code for virtual focal length Lens system design;Lenses;Phase shift;Subwavelength structures 2018-04-10
    https://opticapublishing.figshare.com/articles/software/Matlab_code_for_virtual_focal_length/5527954
10.6084/m9.figshare.5527954.v1